I tried your xorg.conf rerushg but I get 640x480 . . .
I've attached my xorg.conf, it's not that much different from yours.
My Philips FTV can do 1080i on DVI, I know this for sure, cause my other OS supports it too. It seems the video driver just ignores modelines, as soon as I create modelines I end up in 640x480
With the default settings I end up in 1280x720 which is OK, but is not the native res of my display and has a lot of overscan
Thanks for helping. Should I open a new topic for this problem? I think it is the same...